Heat energy recovery device for titanium dioxide spray drying system

Abstract

The utility model relates to a heat energy recovery device for a titanium dioxide spray drying system, which belongs to the technical field of heat energy recovery, and comprises a spray drying system, an exhaust fan, an air inlet pipe, an air feeder and a heat exchanger, the heat exchanger comprises a heat exchange cylinder, an upper air inlet head, a lower air inlet head, a heat exchange pipe, an air distribution ring pipe, a hot air recovery inlet pipe and a hot air recovery outlet pipe, an annular open groove is formed in the bottom of the air distribution ring pipe, a flow guide ring plate is arranged on the portion, on the outer side of the bottom of the open groove, of the air distribution ring pipe, an inward flow guide bend is arranged at the bottom of the flow guide ring plate, and an outlet of the exhaust fan is connected with an air return pipe. The heat exchanger is arranged on the air inlet pipe of the spray drying system, and cold air from the air feeder enters the heat exchanger and exchanges heat with hot air exhausted by the system and pumped by the exhaust fan, so that the temperature of the cold air entering the system is increased, and the consumption of natural gas is greatly reduced when the cold air enters a combustion furnace and is mixed with the natural gas for combustion; the cost is reduced, and more energy is saved.

Description

Technical Field

[0001] The utility model relates to a heat energy recovery device for a titanium dioxide spray drying system, belonging to the technical field of heat energy recovery. Background Art

[0002] During titanium dioxide production, a spray drying system is required to dry the material. The hot air used for drying is the hot air generated by mixing the air in the combustion furnace with natural gas and burning it. The hot air is then passed into the hot air inlet of the spray dryer. The hot air separated by the cyclone separator at the outlet of the spray dryer will be directly discharged, causing heat energy loss. In addition, the air entering the combustion furnace is cold air, resulting in a high amount of natural gas used in the combustion furnace, which increases costs. Utility Model Content

[0003] The utility model provides a heat energy recovery device for a titanium dioxide spray drying system, which solves the problems that the hot air separated by the cyclone separator at the outlet of the current spray dryer is directly discharged, causing heat energy loss, and the air entering the combustion furnace is cold air, resulting in a high amount of natural gas used in the combustion furnace and increased costs.

[0004] The heat exchanger is connected with the heat dissipation device of the present invention, and the heat dissipation device is connected with the heat dissipation device of the present invention.

[0005] As a preferred embodiment, a positioning ring plate is fixed on the lower inner wall of the heat exchange cylinder, and the inner top of the positioning ring plate is provided with an arc-shaped positioning groove that cooperates with the lower outer wall of the air distribution ring tube. The air distribution ring tube is fixed on the positioning ring plate, which can quickly position and support the air distribution ring tube, making installation faster and simpler.

[0006] As a preferred embodiment, the air intake pipe extends into the upper air intake head and is fixed with an inverted funnel-shaped air distribution outer cone disk at one end, and an inverted funnel-shaped air distribution inner cone disk is provided below the air distribution outer cone disk, and an air distribution cavity is provided between the inner air distribution cone disk and the air distribution outer cone disk, and a closed bottom plate that closes the air distribution cavity is provided at the bottom of the inner air distribution cone disk and the air distribution outer cone disk, and a plurality of distribution holes are provided on the closed bottom plate and the inner air distribution cone disk, which can better distribute the air entering the air intake pipe evenly and better perform heat exchange.

[0007] As a preferred embodiment, a distribution pipe is fixed in the distribution hole on the inner cone disk of the air distribution. The top of the distribution pipe is provided with an inclined slope, and the outer wall of the slope is higher than the inner wall. When the air flows to the distribution hole, the gas can be distributed more conveniently through the distribution pipe.

[0008] As a preferred embodiment, the spray drying system includes a spray dryer, the top of the spray dryer is connected to a feed pipe and a hot air inlet pipe, the feed pipe is connected to a feed pump, the hot air inlet pipe is connected to a combustion furnace, a discharge pipe is fixed on the side wall of the spray dryer, the discharge pipe is connected to a cyclone separator, and the top of the cyclone separator is connected to a hot air suction pipe.

[0009] As a preferred embodiment, a discharge pipe is fixed at the bottom of the spray dryer, the other end of the discharge pipe is connected to cyclone separator 2, the top of cyclone separator 2 is connected to the hot air suction pipe, and the bottom of cyclone separator 1 is connected to the discharge pipe through a pipeline.

[0010] As a preferred embodiment, a section of bellows is provided on the air intake pipe to facilitate the removal of the upper air intake head for maintenance of the air distribution inner cone disc and the air distribution outer cone disc.

[0011] The utility model has the following beneficial effects:

[0012] A heat exchanger is installed on the air inlet pipe of the spray drying system. The cold air coming in from the blower enters the heat exchanger and exchanges heat with the hot air before being discharged from the system by the exhaust fan, thereby increasing the temperature of the cold air entering the system. When the cold air enters the combustion furnace and mixes with natural gas for combustion, the use of natural gas is greatly reduced, reducing costs and being more energy-efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 Schematic diagram of the internal structure of the heat exchanger;

[0015] Figure 3 for Figure 2 Partial structure diagram Figure 1 ;

[0016] Figure 4 for Figure 2 Partial structure diagram Figure 2 ;

[0017] Figure 5 This is a schematic diagram of the top structure of the air distribution ring pipe;

[0018] In the figure: 1. blower, 2. air inlet pipe, 3. bellows, 4. heat exchanger, 401. lower air inlet head, 402. hot air recovery inlet pipe, 403. air distribution ring pipe, 404. guide ring plate, 405. positioning ring plate, 406. heat exchange cylinder, 407. heat exchange pipe, 408. distribution pipe, 409. upper air inlet head, 410. air distribution outer cone disk, 411. air distribution inner cone disk, 412. closed bottom plate, 413. hot air recovery outlet pipe, 414. open slot, 5. combustion furnace, 6. return air pipe, 7. spray dryer, 8. discharge pipe, 9. exhaust fan, 10. cyclone separator 2, 11. hot air suction pipe, 12. cyclone separator 1, 13. feed pump. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the embodiments.

[0020] Example 1, as Figures 1 to 5 As shown, the utility model is a heat energy recovery device for a titanium dioxide spray drying system, comprising a spray drying system, wherein a hot air suction pipe 11 of the spray drying system is connected to an exhaust fan 9, an air inlet of the spray drying system is connected to an air inlet pipe 2, the air inlet pipe 2 is connected to a blower 1, a heat exchanger 4 is provided on the air inlet pipe 2, the heat exchanger 4 comprises a heat exchange cylinder 406, the top and bottom of the heat exchange cylinder 406 are respectively connected to an upper air inlet head 409 and a lower air inlet head 401, a plurality of heat exchange pipes 407 are fixedly connected between the upper air inlet head 409 and the lower air inlet head 401, the air inlet pipe 2 is connected to the top of the upper air inlet head 409, and the lower air inlet head 401 is fixedly connected to the upper air inlet head 409. The bottom of the head 401 is connected to the air inlet of the spray drying system through a pipe. The lower part of the heat exchange cylinder 406 is provided with an air distribution ring pipe 403, and the air distribution ring pipe 403 is connected to the hot air recovery inlet pipe 402 that intakes air along its tangential direction. The upper part of the heat exchange cylinder 406 is fixed with a hot air recovery outlet pipe 413. The bottom of the air distribution ring pipe 403 is provided with an annular opening groove 414, and the air distribution ring pipe 403 is provided with a guide ring plate 404 on the outside of the bottom of the opening groove 414. The bottom of the guide ring plate 404 is provided with an inward guide bend. The outlet of the exhaust fan 9 is connected to the return air pipe 6, and the return air pipe 6 is connected to the hot air recovery inlet pipe 402.

[0021] During operation, the spray drying system spray-dries the titanium dioxide wet material liquid with hot air. After the dried material and the hot air are separated, the waste hot air enters the exhaust fan 9 from the hot air suction pipe 11, and then enters the hot air recovery inlet pipe 402 through the return air pipe 6, and then enters the hot air along the tangential direction of the air distribution ring pipe 403. The hot air is distributed through the air distribution ring pipe 403, and the hot air is discharged from the open groove 414. Then, it is guided by the guide ring plate 404 and sprayed to the heat exchange pipe 407, and heat exchange is carried out with the cold air sent into the heat exchange pipe 407 by the blower 1, thereby increasing the temperature of the cold air entering the spray drying system and greatly reducing the use of natural gas.

[0022] In Example 2, based on Example 1, a positioning ring plate 405 is fixed to the lower inner wall of the heat exchange cylinder 406. The inner top of the positioning ring plate 405 is provided with an arc-shaped positioning groove that mates with the lower outer wall of the air distribution ring tube 403. The air distribution ring tube 403 is fixed to the positioning ring plate 405. When the air distribution ring tube 403 is installed, the positioning groove of the positioning ring plate 405 can position and support the lower outer wall of the air distribution ring tube 403.

[0023] An inverted funnel-shaped outer cone 410 is fixed to one end of the intake pipe 2, which extends into the upper intake head 409. Below this outer cone 410 is an inverted funnel-shaped inner cone 411. An air distribution cavity is defined between the inner cone 411 and the outer cone 410. A closed bottom plate 412 encloses the cavity at the bottom of the inner and outer cones 411 and 410. Both the closed bottom plate 412 and the inner cone 411 are provided with multiple distribution holes. When the hot air entering the intake pipe 2 reaches the top of the inner cone 411, it is guided by the inner cone 411 and evenly distributed within the cavity, where it is then evenly distributed through the distribution holes.

[0024] A distribution pipe 408 is fixed in the distribution hole on the air distribution inner cone 411. The top of the distribution pipe 408 is provided with an inclined surface, and the outer wall of the inclined surface is higher than the inner wall. A filter can be set on the hot air suction pipe 11 according to the situation.

[0025] The spray drying system includes a spray dryer 7, the sprayer on the top of the spray dryer 7 is connected to a feed pipe and a hot air inlet pipe, the feed pipe is connected to a feed pump 13, the hot air inlet pipe is connected to a combustion furnace 5, a discharge pipe is fixed on the side wall of the spray dryer 7, the discharge pipe is connected to a cyclone separator 12, and the top of the cyclone separator 12 is connected to a hot air suction pipe 11.

[0026] A discharge pipe 8 is fixed to the bottom of the spray dryer 7. The other end of the discharge pipe 8 is connected to a cyclone separator 10. The top of the cyclone separator 10 is connected to a hot air suction pipe 11. The bottom of the cyclone separator 12 is connected to the discharge pipe 8 via a pipeline. A discharge valve is installed at the bottom of the cyclone separator 10. A heat-resistant filter is installed on the hot air inlet pipe. The liquid material entering the feed pipe and the hot air from the hot air inlet pipe are atomized and sprayed out from the sprayer, drying within the spray dryer 7. After drying, part of the material and hot air enter the cyclone separator 12 through the discharge pipe, and the rest enter the cyclone separator 10 for separation. The hot air enters the hot air suction pipe 11, and the material waits for discharge at the bottom.

[0027] A section of bellows 3 is provided on the air inlet pipe 2 .

[0028] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0029] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

Claims

1. A heat energy recovery device for a titanium dioxide spray drying system, comprising a spray drying system, wherein a hot air suction pipe (11) of the spray drying system is connected to an exhaust fan (9), an air inlet of the spray drying system is connected to an air intake pipe (2), and the air intake pipe (2) is connected to a blower (1), characterized in that: The air inlet pipe (2) is provided with a heat exchanger (4), and the heat exchanger (4) includes a heat exchange cylinder (406). The top and bottom of the heat exchange cylinder (406) are respectively connected to an upper air inlet head (409) and a lower air inlet head (401). A plurality of heat exchange pipes (407) are fixedly connected between the upper air inlet head (409) and the lower air inlet head (401). The air inlet pipe (2) is connected to the top of the upper air inlet head (409), and the bottom of the lower air inlet head (401) is connected to the air inlet of the spray drying system through a pipeline. The lower part of the heat exchange cylinder (406) is provided with an air distribution ring pipe (403 ), the air distribution ring pipe (403) is connected to the hot air recovery inlet pipe (402) that takes in air along its tangential direction, a hot air recovery outlet pipe (413) is fixed to the upper part of the heat exchange cylinder (406), the bottom of the air distribution ring pipe (403) is provided with an annular opening groove (414), a guide ring plate (404) is provided on the air distribution ring pipe (403) outside the bottom of the opening groove (414), and the bottom of the guide ring plate (404) is provided with an inward guide bend, the outlet of the exhaust fan (9) is connected to the return air pipe (6), and the return air pipe (6) is connected to the hot air recovery inlet pipe (402).

2. The heat energy recovery device for a titanium dioxide spray drying system according to claim 1, characterized in that: A positioning ring plate (405) is fixed on the lower inner wall of the heat exchange cylinder (406), and an arc-shaped positioning groove is provided on the inner top of the positioning ring plate (405) to match the lower outer wall of the air distribution ring tube (403). The air distribution ring tube (403) is fixed on the positioning ring plate (405).

3. The heat energy recovery device for a titanium dioxide spray drying system according to claim 1 or 2, characterized in that: An inverted funnel-shaped air distribution outer cone disk (410) is fixed to one end of the air inlet pipe (2) extending into the upper air inlet head (409), an inverted funnel-shaped air distribution inner cone disk (411) is provided below the air distribution outer cone disk (410), an air distribution cavity is provided between the air distribution inner cone disk (411) and the air distribution outer cone disk (410), a closed bottom plate (412) for closing the air distribution cavity is provided at the bottom of the air distribution inner cone disk (411) and the air distribution outer cone disk (410), and a plurality of distribution holes are provided on the closed bottom plate (412) and the air distribution inner cone disk (411).

4. The heat energy recovery device for a titanium dioxide spray drying system according to claim 3, characterized in that: A distribution pipe (408) is fixed in the distribution hole on the air distribution inner cone disk (411), and the top of the distribution pipe (408) is provided with an inclined surface, and the outer side wall of the inclined surface is higher than the inner side wall.

5. The heat energy recovery device for a titanium dioxide spray drying system according to claim 1, characterized in that: The spray drying system includes a spray dryer (7), the top of the spray dryer (7) is connected to a feed pipe and a hot air inlet pipe, the feed pipe is connected to a feed pump (13), the hot air inlet pipe is connected to a combustion furnace (5), a discharge pipe is fixed on the side wall of the spray dryer (7), the discharge pipe is connected to a cyclone separator (12), and the top of the cyclone separator (12) is connected to a hot air suction pipe (11).

6. The heat energy recovery device for a titanium dioxide spray drying system according to claim 5, characterized in that: A discharge pipe (8) is fixed at the bottom of the spray dryer (7), the other end of the discharge pipe (8) is connected to a cyclone separator (10), the top of the cyclone separator (10) is connected to a hot air suction pipe (11), and the bottom of the cyclone separator (12) is connected to the discharge pipe (8) through a pipeline.

7. The heat energy recovery device for a titanium dioxide spray drying system according to claim 1, characterized in that: A section of bellows (3) is provided on the air inlet pipe (2).

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